Comparison

MidiBus vs AUM

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MidiBus

Synchronize MIDI clock signals between apps and devices with adjustable BPM and time signatures. Monitor the accuracy and stability of MIDI clock sources, including the app itself. Discover surprising performance metrics from your connected gear.

Highlights
  • MIDI clock sync generation
  • Adjustable BPM and time signature
  • Multiple MIDI destinations
  • MIDI clock signal monitoring
  • Accuracy and stability measurement
  • iOS MIDI development library based
Features
Read full description

MidiBus is a MIDI clock sync generator and monitor. Choose your bpm, time signature and MIDI destinations. Press the play button and all selected apps and devices will receive a synchronised, rock-solid MIDI sync clock source. On the flipside, monitor the MIDI clock signals of apps and devices (including MidiBus itself) and measure how accurate and stable they really are. You might be very surprised at the results. MidiBus is based on the iOS MIDI development library of the same name. Full details at http://midib.us

About

AUM

This app is a versatile audio mixer, recorder, and connection hub for mobile devices. It allows users to connect various audio sources, route signals, apply effects, and record mixes with high fidelity. It supports advanced features like MIDI control, synchronization, and integration with other audio apps and hardware.

Highlights
  • Connect hardware inputs/outputs
  • Route audio and MIDI
  • Host Audio Unit extensions
  • Record mixes and individual tracks
  • Synchronize with Ableton Link
  • Built-in processing nodes
  • MIDI control and routing
Features
Read full description

AUM is the flexible audio mixer, recorder, and connection hub for your iPad, iPhone and iPod touch. Connect hardware inputs and outputs, Audio Unit extensions, Inter-App Audio apps, Audiobus, soundfile players, built-in signal processing and filters, in any configuration you want. Route anything to anywhere with mix-busses, effect sends, audiobus ports, and external multi-channel audio interfaces. Play hosted synths and instruments using the built-in keyboard or external MIDI controllers, or sequence them with AU MIDI plugins or from other apps using Virtual MIDI. Record mixes, individual tracks, or both, straight into the storage space of AudioShare (no copying of files needed), with synchronized start and end for perfect loops. Play back recordings, soundfiles and loops as channel sources in the mixer for backing tracks, further processing or mixing. Soundfiles can be opened from anywhere, including USB drives on iOS 13 and later. Route and filter MIDI in any way you like using the MIDI matrix. Combine and filter MIDI endpoints using MIDI buses. Synchronize everything with the transport clock and play in time with other apps or devices using Ableton Link. Connect external music machines and synchronize them with MIDI Clock. Includes built-in processing nodes for various stereo processing, Mid/Side balance and conversion, EQs and filters, limiting, clipping and saturation. Or use any 3rd party Audio Unit extension or Inter-App Audio effect. All controls in the mixer can be controlled via MIDI, including parameters of hosted and built-in plugins. "A brilliant idea that has been brilliantly executed. Top-notch technical stuff and highly recommended" - MusicAppBlog "Feature rich, powerful, intuitive, and simple to use" - DubSpot "Executes live mixing with surprising ease, with a load of extensive features under the hood, quick snappy response on the screen and audio" - AudioNewsRoom FEATURES • High quality audio up to 32-bit 192kHz • Clean and intuitive user interface with crisp vector graphics • Unlimited number of channels • Unlimited number of effect slots • Inserts and sends are configurable pre/post-fader • Internal busses for mixing, effect sends, signal splitting • Supports multi-channel audio interfaces for both inputs and outputs • Supports built-in speaker and mic, including stereo mic on devices that has it. • Supports Audio Unit extensions, Inter-App Audio and Audiobus • Route MIDI output from Audio Unit extensions • Supports Audio Unit multiple output and input busses (for side-chaining etc) • Highly accurate transport clock • Metronome with selectable output and optional pre-roll • Sends host sync to Audio Unit plugins and IAA apps • Play in time with Ableton Link, with Start/Stop support • Slave external hardware via MIDI Clock • FilePlayer with sync and looping with access to all your soundfiles • Records straight into AudioShare storage space • Record synchronized beat-perfect loops • Built-in nodes for stereo processing, filtering and dynamics • Latency compensation makes everything align at the outputs • Optional manual compensation using TimeOffset • Multiple Inter-App Audio / Audiobus output ports • Audiobus state saving • Built-in MIDI keyboard • Fully MIDI controllable • MIDI Matrix for routing MIDI anywhere • MIDI filtering for any MIDI destination • Combine MIDI sources or destinations using MIDI buses BUILT-IN SIGNAL PROCESSING • Stereo balance • Stereo to mono • Stereo panning • Mid/Side balance • Mid/Side - Stereo convert • Invert Phase • Parametric EQ • Low-shelf filter • High-shelf filter • Low-pass resonant filter • High-pass resonant filter • LP/HP combo filter • First order All-pass filter • Second order All-pass filter • Gain • Hard clip • Saturation • Lookahead peak limiter • System-provided Apple Audio Units

Screenshots

MidiBus1 screens
AUM4 screens

Verdict

The call

The clearest difference is price: MidiBus at $2.99 against AUM's $24.99. MidiBus also leads on in-app purchases (none vs 4) and rating (5.0 vs 4.7). AUM's advantage is ratings volume (535 vs 2). On update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

MidiBus costs $2.99 and AUM $24.99 up front. AUM sells 4 one-off in-app purchases. MidiBus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

MidiBus holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: AUM has 535 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 94% of MidiBus's written reviews are positive against 82% of AUM's.

UpkeepUpdate frequency

MidiBus ships an update every 5 months, AUM every 3 months. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

Scorecard7 real differences · 3 level
MidiBus versus AUM: the parameters behind the verdict, then further details
ParameterMidiBusAUM
Price$2.99 — better$24.99
Rating5.0 (2 ratings) — better4.7 (535 ratings)
Positive reviews93.8% of reviews — better81.9% of reviews
Number of ratings2535 — better
Update frequencyEvery 5 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS5.1.1 — better12.0
Further details — not scored
Size2 MB13 MB
Age rating4+4+
DeveloperAudeonic AppsKymatica AB

Customer experience

MidiBus

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews16 reviews
Positive93.8%
Neutral0.0%
Negative6.3%

AUM

All ratings524 ratings
Positive93.3%
Neutral1.5%
Negative5.2%
Written reviews315 reviews
Positive81.9%
Neutral5.7%
Negative12.4%

Bugs and requests

MidiBus

Not enough reviews yet to summarise bugs or requests.

AUM

Reported bugs

3 issues
  • Crashes or freezes when using certain plugin combinations
  • Compatibility issues with iOS 15 and newer
  • Inconsistent MIDI transport controls

Requested features

4 requests
  • Add MIDI clock sync receive capability
  • Implement a timeline/sequencer view
  • Provide more visual customization options
  • Improve support for external hardware integration

In-app purchases

None

MidiBus

No in-app purchases

4 purchases

AUM

One-time4
  • Small Tip$0.99
  • Medium Tip$1.99
  • Large Tip$4.99
Show 1 more
  • Huge Tip$9.99

Questions

Is MidiBus free?
MidiBus costs $2.99, with no in-app purchases.
Is AUM free?
AUM costs $24.99, and also offers in-app purchases.
Which has better reviews, MidiBus or AUM?
MidiBus is rated higher. MidiBus averages 5.0 out of 5 from 2 ratings, while AUM averages 4.7 from 535 ratings.
Do MidiBus or AUM have ads?
Neither MidiBus nor AUM shows ads.
Which is updated more often, MidiBus or AUM?
MidiBus ships an update every 5 months, and AUM every 3 months. Most recently, MidiBus was updated on November 1, 2026 and AUM on November 11, 2026.

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